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In a schooner with two masts, even if the masts are of the same height, the after one usually carries a larger sail (because a longer boom can be used), so the after mast is the mainmast. This contrasts with a ketch or a yawl , where the after mast, and its principal sail, is clearly the smaller of the two, so the terminology is (from forward ...
Measurements show that wind speed, (V (h) ) varies, according to a power law with height (h) above a non-zero measurement height datum (h 0 —e.g. at the height of the foot of a sail), using a reference wind speed measured at the datum height (V (h 0) ), as follows: [24] [25]
It is a measurement of capacity for cargo in bales or pallets, etc, where the cargo does not conform to the shape of the ship. Grain Cube (or Grain Capacity ) – The maximum space available for cargo measured in cubic metres or feet, the measurement being taken to the inside of the shell plating of the ship or to the outside of the frames and ...
8 – mast 9 – spreader 10 – shroud 11 – sheet 12 – boom 13 - mast 14 – spinnaker pole 15 – backstay 16 – forestay 17 – boom vang On a sailing vessel, a forestay, sometimes just called a stay, is a piece of standing rigging which keeps a mast from falling backwards.
The lowest and normally largest sail on a mast is the course sail of that mast, and is referred to simply by the mast name: Foresail, mainsail, mizzen sail, jigger sail or more commonly forecourse etc. Even a full-rigged ship did not usually have a lateral (square) course on the mizzen mast below the mizzen topmast.
Defined by sail plan. All masts have fore-and-aft sails. Schooner: fore-and-aft rigged sails, with two or more masts, the aftermost mast taller or equal to the height of the forward mast(s) All masts have square sails. Brig: two masts, square rigged (may have a spanker on the aftermost) Full-rigged ship: three or more masts, all of them square ...
Mathematically, the Universal Rule formula as introduced in 1903 was: = [5]. Variables: L - Rated boat length, definition tweaked from year to year by the New York Yacht Club; S - Measured sail area, up to 1923 to British Navy method, then amended for 3/4 mast-height jibstay and foresails, after the 1928 IYRU London Conference same as Metre-boats of the International Rule.
The course sail is the lowermost sail. In sailing, a course is a type of square sail. It is the sail set on the lowest yard on a mast. The courses are given a name derived from the mast on which they are set, so the course on the foremast may be called the fore-course or the foresail; similarly main-course or mainsail for that carried on the ...